<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区 -->
    <el-card class="box-card">
      <!-- 警告区域 -->
      <el-alert
        title="注意：只允许为第三级分类设置相关参数！"
        type="warning" show-icon :closable="false"></el-alert>
      <!-- 选择商品分类区域 -->
      <el-row>
        <el-col>
          <span>选择商品分类：</span>
          <!-- 商品分类的级联选择框 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="catelist"
            :props="cateProps"
            @change="handleChange"
            style="width: 20%"
            clearable
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- tab页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 动态参数表格 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数按钮 -->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数
          </el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                >{{ item }}
                </el-tag>
                <!-- 输入Tag文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag
                </el-button>
              </template>
            </el-table-column>
            <el-table-column type="index" label="序号"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button size="mini" type="danger" @click="deleteDiaolog(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性按钮 -->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性
          </el-button>
          <!-- 静态参数表格 -->
          <el-table :data="onlyTableData" border stripe>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                >{{ item }}
                </el-tag>
                <!-- 输入Tag文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag
                </el-button>
              </template>
            </el-table-column>
            <el-table-column type="index" label="序号"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button size="mini" type="danger" @click="deleteDiaolog(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="`添加` + titleText"
      :visible.sync="addDialogVisible"
      width="30%" @close="addDialogClosed">
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParmas">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 编辑参数的对话框 -->
    <el-dialog
      :title="`修改` + titleText"
      :visible.sync="editParmasDialogVisible"
      width="30%" @close="editParmasClosed">
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editParmasDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParmas">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: 'Params',
  data() {
    return {
      // 商品分类列表
      catelist: [],
      // 指定级联选择器的配置对象
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        checkStrictly: true
      },
      // 级联选择框双向绑定到的数组
      selectedCateKeys: [],
      // 被激活的页签的名称
      activeName: 'many',
      // 动态参数数据
      manyTableData: [],
      // 静态属性数据
      onlyTableData: [],
      // 控制添加参数对话框的显示
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      // 添加表单的验证规则对象
      addFormRules: {
        attr_name: [
          {required: true, message: '请输入参数名称', trigger: 'blur'}
        ]
      },
      // 控制编辑参数对话框的显示
      editParmasDialogVisible: false,
      // 编辑参数的表单数据对象
      editForm: {},
      // 修改表单的验证规则对象
      editFormRules: {
        attr_name: [
          {required: true, message: '请输入参数名称', trigger: 'blur'}
        ]
      }
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    async getCateList() {
      const {data: res} = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.catelist = res.data
    },
    // 选择项发生变化触发这个函数
    handleChange() {
      this.getParamsData()
    },
    // Tab页签点击事件的处理函数
    handleTabClick() {
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData() {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return 0
      }
      // 证明选中的是三级分类
      // 根据所选分类的Id和当前所处的面板，获取对应的参数。
      const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {
        params: {sel: this.activeName}
      })
      // console.log(res)
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      res.data.forEach(item => {
        //   通过三元表达式判断attr_vals是否为空
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听添加参数对话框的关闭事件,清空输入
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 添加参数
    addParmas() {
      this.$refs.addFormRef.validate(async valid => {
        // 表单预校验失败
        if (!valid) return
        // 发起添加参数的数据请求
        const {data: res} = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        // console.log(res)
        if (res.meta.status !== 201) {
          return this.$message.error(res.meta.msg)
        }
        this.addDialogVisible = false
        // 刷新数据列表
        this.getParamsData()
        // 提示修改成功
        return this.$message.success(res.meta.msg)
      })
    },
    // 点击按钮，展示修改对话框
    async showEditDialog(attrId) {
      // console.log(attrId)
      const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`, {
        params: {attr_sel: this.activeName}
      })
      // console.log(res)
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.editParmasDialogVisible = true
      this.editForm = res.data
    },
    // 重置修改的表单
    editParmasClosed() {
      this.$refs.editFormRef.resetFields()
    },
    // 编辑提交参数
    editParmas() {
      this.$refs.editFormRef.validate(async valid => {
        // console.log(valid)
        if (!valid) return
        const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) {
          return this.$message.error(res.meta.msg)
        }
        this.$message.success(res.meta.msg)
        this.getParamsData()
        this.editParmasDialogVisible = false
      })
    },
    // 删除参数
    async deleteDiaolog(attrId) {
      // 弹框询问用户是否删除数据
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 点击确定 返回值为：confirm
      // 点击取消 返回值为： cancel
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      const {data: res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.$message.success(res.meta.msg)
      this.getParamsData()
    },
    // 文本框失去焦点或按enter键
    handleInputConfirm(row) {
      // 输入的内容为空时，清空
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 提交数据库，保存修改
      this.saveAttrVals(row)
    },
    // 将对attr_vals（Tag） 的操作 保存到数据库
    async saveAttrVals(row) {
      const {data: res} = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.$message.success(res.meta.msg)
    },
    // 点击按钮展示文本输入框
    showInput(row) {
      row.inputVisible = true
      //   让输入框自动获取焦点
      // $nextTick方法的作用：当页面元素被重新渲染之后，才会至指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应的参数可选项
    handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    // 如果按钮需要被禁用，则返回true，不需要则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类的id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        console.log(this.selectedCateKeys)
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style scoped lang="less">
.cat_opt {
  margin: 15px 0px;
}

.el-tag {
  margin: 8px;
}

.input-new-tag {
  width: 120px;
}
</style>
